Skip to main content
U.S. flag

An official website of the United States government

Black newly applied sealcoat contrasts with unsealed asphalt

June 2004 (approx.)

Detailed Description

Newly applied coal-tar-based sealcoat is dark black, sharply contrasting with the unsealed asphalt parking lot below. Coal-tar-based sealcoat is a potent source of polycyclic aromatic hydrocarbons (PAHs)


Public Domain.